Microparticle enhanced special high temperature wear-resisting brazing bar and manufacturing method thereof

Abstract

The invention provides a microparticle enhanced special high temperature wear-resisting brazing bar. The brazing bar comprises a microparticle enhanced hollow copper brazing filler metal inner core, Co-coated Cr2O3 composite particles filled into the microparticle enhanced hollow copper brazing filler metal inner core, and a copper brazing flux coating adhering to the outer surface of the microparticle enhanced hollow copper brazing filler metal inner core. The microparticle enhanced hollow copper brazing filler metal inner core comprises a metal phase and micrometer SiC particles. The metal phase is composed of metal elements including, by mass percent, 1.1-1.4% of Ag, 0.6-0.9% of Mn, 0.4-0.5% of La, 1.3-2.93% of Sn, 1.6-1.8% of Nd and the balance Cu. The invention further provides a method for manufacturing the microparticle enhanced special high temperature wear-resisting brazing bar. The microparticle enhanced special high temperature wear-resisting brazing bar can improve wear-resisting performance and tensile strength of the brazing layer.

Description

technical field [0001] The invention relates to the technical field of brazing materials, in particular to a micron particle reinforced ultra-high temperature wear-resistant brazing rod and a preparation method thereof. Background technique [0002] At present, titanium and titanium alloys are widely used in industrial production and social life. Due to their small specific gravity, high strength, good corrosion resistance and biocompatibility, titanium and titanium alloys are widely used in aerospace, chemical industry, biomedicine and civil life. The important roles in other fields are different and replaced. Especially in the application in the field of aerospace, in order to improve the high temperature and wear resistance of the spacecraft surface, it is necessary to install a layer of ultra high temperature wear resistant coating on the surface of titanium and titanium alloy. [0003] Common methods for forming ultra-high temperature wear-resistant coatings on the sur...

AI Technical Summary

Problems solved by technology

Among them, the thickness of the ultra-high temperature wear-resistant coating formed by physical vapor deposition and chemical vapor deposition is usually relatively thin; the ultra-high temperature wear-resistant coating formed by plasma spraying and flame spraying can generally only reach a thickness of about 0.5 mm; and Although the surfacing welding method can form a thicker wear-resistant coating, the heating temperature is higher, and the coating and the titanium alloy substrate are prone to thermal stress; although the brazing method can obtain a relatively large thickness range at a lower welding temperature Coating, but because titanium is a highly chemically active metal, brazing is more difficult, it needs to be brazed under the protection of vacuum or inert gas, and the silver-based, palladium-based, titanium-based or aluminum-based solder used for brazing Among them, due to the high price of palladium and silver, and the titanium-based brazing material itself is relatively brittle, the processing performance is poor, and the aluminum-based brazing material has low brazing strength, so it can only be used in working conditions that do not require high strength.